This document discusses the relative merits of the physical and chemical properties of hydraulic fluids in relation to the aerospace hydraulic system design, and the related materials compatibility. The discussion in this report applies both to hydrocarbon and phosphate ester based aircraft hydraulic fluids. In some cases, numerical limits are suggested, but, in general, the significance and effect of a property is noted qualitatively.
SAE AIR81E-2019 history
2019SAE AIR81E-2019 Importance of Physical and Chemical Properties of Aircraft Hydraulic Fluids
2016SAE AIR81D-2016 Importance of Physical and Chemical Properties of Aircraft Hydraulic Fluids
2011SAE AIR81C-2011 Importance of Physical and Chemical Properties of Aircraft Hydraulic Fluid